Electric light fixture



Oct.. 5, 1937. E. E. HoLT ELECTRIC LIGHT FIXTURE Original Filed March25, 1936 Patented Oct. 5, 1937 UNITED STATES PATENT oF'FlcE Divided andthis application August 13, 1936, Serial No. 95,748

2 Claims.

This invention relates to an electric li-ght fixture which is adjustableso as to enable the user to position the light at various placesaccording to the requirements of his work. A xture of this 5 kind isparticularly suitable for use in manufactories, or in laboratories whereit is important that the light should be brought to the mostadvantageous position. A disclosure of the present invention was firstmade in my pending application, Serial No. 70,722, filed March 25, 1936,of which this case is a division.

For its objects my invention is concerned with a simplified connectionbetween a conduit tube and an outlet box from which is extended abracket for supporting the xture; and with friction joints between theseveral sections forming the adjustable xture arm. All this isaccomplished in a manner that is inexpensive and dependable.

20 An exemplication of my 4invention is set forth in the accompanyingdrawing wherein:

Figure 1 is a View in elevation of my adjustable light fixture supportedupon a bracket carried by an outlet box, the latter part being shown insection; and

Fig. 2 is an enlarged detail in section of the friction joint proximateto the socket, taken on line 2 of Fig. 1.

As shown, the socket comprises a shell S to which is connected a domedcap C from which rises a nipple 6 wherein is tted a bushing B interiorlythreaded for connection with a short tubular Section 'I. Such a sectionmay be extended from a bracket 8 having a mounting at one side of acircular disk 9 pivotally joined as by a hollow rivet I with acomplementary disk II forming part of a friction joint J. I'he two diskswhich are co-radial are spaced apart near their peripheries where insetanges I2 extend toward each other, nearly meeting centrally, as shownbest in Fig. 2. Within the peripheral channel thus formed is extended aband I whose two ends I6 are joined, adjustably if desired as by a boltI1, so as to apply to the disks a de- 45 sired friction which willprevent free turning movement therebetween.

The complementary disk I I is provided with a bracket 20 joined to oneend of a tubular section 2| whose opposite end is connected to a bracket28 having connection with another friction joint J which may comprisecomplementary circular disks the same as already described. The numberof joints with associated tubular sections may be increased as desired,so that further description of such duplicate parts is unnecessary.'I'he joint adjacent the base whereon the xture is supported is providedwith a bracket 38 from which depends a short tubular section 39 having arotatable mounting in a bearing 40 that is formed at one end of abracket 4I which extends laterally from an elongated outlet box 42having a side opening with a removable cover plate 43. The tubularsection 39 is secured against removal from the bearing 40 as by means ofwashers 44 and a lock nut 45.

The outlet box is provided with end walls 46, in each of which is anopening 4'I with a surrounding outwardly extending nipple 48 internallythreaded to receive a hollow nut or plug 49 having a polygonal head 50.Through the plug is extended a conduit 5I Whose end is outwardly fiaredas at 52, the interior of the plug being tapered somewhat in conformitytherewith. When the plug is screwed home, the conduit is wedged tightlyin place against the end wall of the outlet box so as to be firmlyconnected therewith. A similar construction may be employed at each endof the box, permitting wiring W to be extended therethrough and throughthe conduits, with a connection X from the outlet box through an opening53 adjacent the bracket 4I extending through the tubular section 39 andthe various sections of the adjustable fixture to the socket S.

The socket is provided interiorly with the usual insulation Isurrounding a threaded collar 60 into which the threaded neck of a lightbulb may be secured, also with an insulated head H in connectiontherewith to which the wires may be joined in the usual way.

I claim:

1. In combination with a pair of sections comprised in a lightingfixture arm, a swivel joint between the two sections, the jointconsisting of two complementary circular disks one connected to eachsection, each disk being formed to abut the other in its axial regionand being spaced from the other adjacent its periphery where it isprovided with an inset ilange extending toward the other to terminatejust short of mutual engagement, a pivotal axial connection between thetwo disks, and a friction band extending around Within the channelaiiorded by the inset peripheral flanges of the disks adapted to occupya selected circumferential position thereupon while opposing with equalforce in either direction a rotary movement of one disk with respect tothe other.

2. In combination with a pair of sections comprised in a lighting xturearm, a swivel joint between the two sections, the joint consisting of Yt, Y 2,094,656

two complementary circular disks one connected to each section, eachdisk being formed to engage the other 'only in its axial region andbeing spaced from the other adjacent its periphery where it is providedwith a Vflange extending toward the other to terminate just short ofmutual engagement, a pivotal axial connection between the two disks,a/fricton.. band extendingaroundthe peripheral flanges' ofthetwo dislsadaptedto oc-

